List of United States Numbered Highways

United States Numbered Highway System
United States Numbered Highway System
	U.S. Highway shields
	Map of the present U.S. Highway network
System information
Length	157,724 mi (253,832 km)
Formed	November 11, 1926
Highway names
US Highways	U.S. Highway nn (US nn); U.S. Route nn (US nn)
System links
	United States Numbered Highway System; List; Special; Divided;

United States Numbered Highways are components of a national system of highways that is administered by the American Association of State Highway and Transportation Officials (AASHTO) and the various state departments of transportation. These U.S. Numbered Highways were initially designated on November 11, 1926, and extend throughout the contiguous United States.

There are several U.S. Highways that exist entirely within one state. Since the current policy on numbering and designating US Highways was written in 1991, AASHTO has been in the process of eliminating all intrastate U.S. Highways under 300 miles (480 km) in length, "as rapidly as the State Highway Department and the Standing Committee on Highways of the American Association of State Highway and Transportation Officials can reach agreement with reference thereto"; new additions to the system must therefore serve more than one state.^[3]

^ Weingroff, Richard F. (April 7, 2011). "From Names to Numbers: The Origins of the US Numbered Highway System". Highway History. Federal Highway Administration. Retrieved June 10, 2011.
^ American Association of State Highway and Transportation Officials (1989). United States Numbered Highways (PDF) (1989 ed.). Washington, DC: American Association of State Highway and Transportation Officials. p. iv. OCLC 37586174. Archived from the original (PDF) on January 1, 2014. Retrieved September 17, 2016.
^ American Association of State Highway and Transportation Officials (January 2000) [retained from October 13, 1991]. "Establishment and Development of United States Numbered Highways" (PDF). AASHTO Transportation Policy Book. Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 22, 2014. Retrieved January 16, 2014.

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[FHWA_planning-1] Weingroff, Richard F. (April 7, 2011). "From Names to Numbers: The Origins of the US Numbered Highway System". Highway History. Federal Highway Administration. Retrieved June 10, 2011.

[USRN-2] American Association of State Highway and Transportation Officials (1989). United States Numbered Highways (PDF) (1989 ed.). Washington, DC: American Association of State Highway and Transportation Officials. p. iv. OCLC 37586174. Archived from the original (PDF) on January 1, 2014. Retrieved September 17, 2016.

[AASHTO_purpose-4] American Association of State Highway and Transportation Officials (January 2000) [retained from October 13, 1991]. "Establishment and Development of United States Numbered Highways" (PDF). AASHTO Transportation Policy Book. Washington, DC: American Association of State Highway and Transportation Officials. Archived from the original (PDF) on October 22, 2014. Retrieved January 16, 2014.

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